Blade outer air seal hybrid casting core

Abstract

A hybrid sacrificial core for forming an impingement space and an internal cooling passageway network separate from the impingement space of a part may comprise a ceramic core having a first surface portion for forming the impingement space, and a refractory metal core that forms a plurality of passages of the internal cooling passageway network.

1 . A hybrid sacrificial core for forming an impingement space and an internal cooling passageway network separate from the impingement space of a part, the core comprising:
 a ceramic core having a first surface portion for forming the impingement space, wherein the ceramic core is comprised of at least two separate distinct parts; and   a refractory metal core that forms a plurality of passages of the internal cooling passageway network.   
     
     
         2 . (canceled) 
     
     
         3 . The sacrificial core of  claim 1 , wherein the two separate distinct parts are of the same geometry. 
     
     
         4 . The sacrificial core of  claim 1 , wherein the refractory metal core is comprised of four distinct parts. 
     
     
         5 . The sacrificial core of  claim 4 , wherein the refractory metal core is comprised of a leading edge core, a trailing edge core, and two side cores. 
     
     
         6 . The sacrificial core of  claim 4  wherein the four distinct parts are joined together. 
     
     
         7 . The sacrificial core of  claim 4  wherein at least one of the distinct parts contains an axial portion and a radial portion. 
     
     
         8 . The sacrificial core of  claim 4 , wherein the four distinct parts are arranged at ninety degrees with respect to each adjacent part, and wherein a generally rectangular space is contained among the four distinct parts. 
     
     
         9 . The sacrificial core of  claim 4 , wherein at least two of the leading edge core, trailing edge core, and two side cores are minor images of one another. 
     
     
         10 . The sacrificial core of  claim 1 , wherein the ceramic core is attached to the refractory metal core. 
     
     
         11 .- 20 . (canceled) 
     
     
         21 . The sacrificial core of  claim 3  wherein the two separate distinct parts each contain an axial portion and a radial portion.